a) 2 целых 1/12 * 0,8 b) 2 целых 1/4 * 7/9 + 2/9 * 2 целых 1/4. Created by Bikovtv. matematika-ru

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a) 2 целых 1/12 * 0,8 b) 2 целых 1/4 * 7/9 + 2/9 * 2 целых 1/4

vikakotik52 А)2 1/12*8/10=13/12*8/10=13/15
б)2 1/4*7/9+2/9*2 1/4=2 1/4*(7/9+2/9)=2 1/4

3 votes Thanks 4

lenok3781
$2 \frac{1}{12} \times 0.8 = \frac{25}{12} \times \frac{8}{10} = \frac{5 \times 2}{3 \times 2} =$

$\frac{10}{6} = \frac{5}{3} = 1 \frac{2}{3}$

$2 \frac{1}{4} \times \frac{7}{9} + \frac{2}{9} \times 2 \frac{1}{4} = 2 \frac{1}{4} \times ( \frac{7}{9} +$

$\frac{2}{9} ) = \frac{9}{4} \times ( \frac{9}{9} ) = \frac{9}{4} \times 1 = \frac{9}{4} =$

$2 \frac{1}{4}$

3 votes Thanks 5

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